4- [Some verication]. VERIFY: - If L is a linear subspace, the decomposition : 1' - IL + IL- is unique. - If the lines of A generate L, then 1'9\"; = L'- - A set K is a cone if and only if K 'i :5 and is closed under conic combinations. - Verify that the special case is {1:141- s: b was] ; [g] -.=: [A,b] a. [3,5]} directly reduces to a linear optimization problem with polyhedral representable : mines: 51le a it: 4- z} Az 5.4.\" is 2: 0,: + z E: 0 r without going through the abstract and heavy construction